Fisher A41 Instruction Manual page 16

1. Removing the retainer ring (key 2):
For valves with press-fit retainer rings:
D Place the valve on blocks with the seal retainer facing down. (Note: Position blocks so they do not restrict the
retainer ring removal.)
D Rotate the disc to the open position as shown in figure 7.
D On the seal ring side of the retainer ring, locate one of the knock-out points machined on the retainer ring. Using a
hammer and flat end punch on the knock-out point, pop-out the retainer ring from the valve body (see figure 8).
CAUTION
When popping out the retainer ring, be very careful to hit only the knock-out points. Hitting anywhere else can cause
non-repairable damage to the t-slot area.
D For valves with PTFE seal rings, remove the spring (key 5) as it may be necessary to re-install the spring into the new
PTFE seal ring.
D Clean all sealing surfaces and parts before re-assembly. Proceed to step 3 below.
For valves with screwed retainer rings:
D Place the valve on blocks with the seal retainer facing up.
D Remove the retainer ring screws (key 23). If necessary, use two of the retainer screws, in the tapped holes in the
retainer ring (key 2) to jack the retainer ring loose from the valve body surface.
2. Remove the seal ring from the valve body seal ring slot.
D For valves with PTFE seal rings, remove the spring (key 5) as it may be necessary to re-install the spring into the new
PTFE seal ring.
D For valves with metal seals, remove the gasket (key 16) from the valve body surface, and discard it as replacement is
recommended.
3. If it is necessary to replace the disc, drive shaft, and the bearings, refer to the Disc, Drive Shaft, and Bearing
Maintenance section before proceeding with the assembly procedures for the seal ring and retainer. The seal ring
could be damaged if it is in place while removing the disc.
CAUTION
Follow instructions in this manual to avoid damage to the seal ring while either removing or installing the disc.
Assembly
Place the valve on blocks with the seal retainer facing up. If the replacement disc, shaft, and bearings have not been
installed in the valve body, go to the Assembly procedures to install them. Do not install the seal ring without the disc
being in place. The seal ring could be damaged while installing the disc.
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